U.S. patent application number 15/661545 was filed with the patent office on 2017-11-09 for spring member for an electrical switching element.
This patent application is currently assigned to Tyco Electronics Austria GmbH. The applicant listed for this patent is Tyco Electronics Austria GmbH. Invention is credited to Markus Gutmann, Rudolf Mikl.
Application Number | 20170323740 15/661545 |
Document ID | / |
Family ID | 52444164 |
Filed Date | 2017-11-09 |
United States Patent
Application |
20170323740 |
Kind Code |
A1 |
Gutmann; Markus ; et
al. |
November 9, 2017 |
Spring Member For An Electrical Switching Element
Abstract
A spring for an electrical switch comprises a contact arm and a
base from which the contact arm extends. The contact arm has a
contact member. The base has a terminal and an extension. The
extension extends from the contact arm to the terminal and away
from a remaining base.
Inventors: |
Gutmann; Markus; (Brand,
AT) ; Mikl; Rudolf; (Maria Ellend, AT) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Tyco Electronics Austria GmbH |
Vienna |
|
AT |
|
|
Assignee: |
Tyco Electronics Austria
GmbH
Vienna
AT
|
Family ID: |
52444164 |
Appl. No.: |
15/661545 |
Filed: |
July 27, 2017 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
PCT/EP2016/052004 |
Jan 29, 2016 |
|
|
|
15661545 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H01H 50/642 20130101;
H01H 50/56 20130101; H01H 3/48 20130101; H01H 2205/002 20130101;
H01R 13/2442 20130101; H01H 3/38 20130101 |
International
Class: |
H01H 3/38 20060101
H01H003/38 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 30, 2015 |
DE |
15153205.8 |
Claims
1. A spring for an electrical switch, comprising: a contact arm
having a contact member; and a base from which the contact arm
extends, the base having a terminal and an extension extending from
the contact arm to the terminal and away from a remaining base.
2. The spring of claim 1, wherein the spring provides a current
path extending from the contact member through the terminal.
3. The spring of claim 2, wherein the current path extends through
the base including the extension.
4. The spring of claim 1, wherein a smallest cross-sectional area
of the base including the extension is equal to a smallest
cross-sectional area of the contact arm.
5. The spring of claim 4, wherein the base is formed by at least
two layers of a sheet material.
6. The spring of claim 5, wherein the extension is formed by
folding the sheet material along a folding edge.
7. The spring of claim 6, wherein the extension is folded
180.degree. about the folding edge.
8. The spring of claim 6, wherein the folding edge extends
perpendicular to a longitudinal direction of the contact arm.
9. The spring of claim 6, wherein the base has a width in a bent
state after folding the extension which is approximately half a
width of the base in a pre-bent state prior to folding the
extension.
10. The spring of claim 1, wherein the spring is formed from a
stamped and bent sheet material.
11. The spring of claim 1, wherein the extension has a fixation
element fixing the base to an electrical switch.
12. The spring of claim 11, wherein the base is a stationary part
of the spring in the electrical switch and the contact arm is
elastically deflectable with respect to the base.
13. The spring of claim 5, wherein the terminal is formed by
folding the sheet material along a folding edge.
14. The spring of claim 13, wherein the folding edge extends
parallel to a longitudinal direction of the contact arm.
15. The spring of claim 13, wherein the terminal has a width in a
bent state after folding which is approximately half a width of the
terminal in a pre-bent state prior to folding.
16. The spring of claim 4, wherein a pair of spring arms extend
from the contact arm.
17. The spring of claim 16, wherein the contact arm has an opening
disposed between the pair of spring arms.
18. An electrical switch, comprising: a spring including a contact
arm having a contact member and a base from which the contact arm
extends, the base having a terminal and an extension extending from
the contact arm to the terminal and away from a remaining base.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of PCT International
Application No. PCT/EP2016/052004, filed on Jan. 29, 2016, which
claims priority under 35 U.S.C. .sctn.119 to European Patent
Application No. 15153205.8, filed on Jan. 30, 2015.
FIELD OF THE INVENTION
[0002] The present invention relates to a spring and, more
particularly, to a spring for an electric switch such as a
relay.
BACKGROUND
[0003] Known springs used in electric switches such as relays or
contactors have a contact arm with a contact member and a base from
which the contact arm extends. The base has a terminal. The known
springs are used within the electrical switches to open or close an
electrical circuit. In miniaturized and standardized systems, the
available space for springs in electrical switches is limited,
making it difficult to provide a spring which fulfills elasticity
and conductivity requirements of the electrical switch.
SUMMARY
[0004] A spring for an electrical switch according to the invention
comprises a contact arm and a base from which the contact arm
extends. The contact arm has a contact member. The base has a
terminal and an extension. The extension extends from the contact
arm to the terminal and away from a remaining base.
BRIEF DESCRIPTION OF THE DRAWINGS
[0005] The invention will now be described by way of example with
reference to the accompanying figures, of which:
[0006] FIG. 1 is a top view of a spring according to the invention
in a pre-bent state;
[0007] FIG. 2 is a top view of the spring of FIG. 1 in a bent
state; and
[0008] FIG. 3 is a side view of the spring of FIG. 1 in the bent
state.
DETAILED DESCRIPTION OF THE EMBODIMENT(S)
[0009] Exemplary embodiments of the present invention will be
described hereinafter in detail with reference to the attached
drawings, wherein like reference numerals refer to like elements.
The present invention may, however, be embodied in many different
forms and should not be construed as being limited to the
embodiments set forth herein; rather, these embodiments are
provided so that the present disclosure will be thorough and
complete, and will fully convey the concept of the disclosure to
those skilled in the art.
[0010] A spring 5 according to the invention is shown in FIGS. 1-3.
A monolithic sheet material 3 is stamped and bent into a
stamped-bent part 1 to form the spring 5. The spring 5, as shown in
FIG. 1, comprises a contact arm 7 and a base 13 from which the
contact arm 7 extends. The spring 5 is shown in a pre-bent state P
in FIG. 1.
[0011] The contact arm 7, as shown in FIG. 1, extends essentially
along a longitudinal axis L and has a contact member 9. In other
embodiments, the contact arm 7 may have more than one contact
member 9. The contact member 9 is disposed on an elastically
deflectable free end 11 of the contact arm 7. The entire contact
arm 7 is elastically deflectable in a direction perpendicular to
both the longitudinal direction L and a plane defined by the sheet
material 3. The contact arm 7 extends from the base 13 and is
elastically deflectable with respect to the base 13.
[0012] The base 13 forms a stationary part of the spring 5 in an
electrical switch (not shown). The base 13, as shown in FIG. 1, has
a terminal 15 and an extension 17. The terminal 15 electrically
connects the spring 5 to other elements. In various embodiments,
the terminal 15 may form a contact pin for a mating connection
element or may be soldered to electrical conductors. The extension
17, as shown in FIG. 1, extends from the contact arm 7 to the
terminal 15 and away from a remaining base 13 not consisting of the
terminal 15 and the extension 17. In the pre-bent state P shown in
FIG. 1, the extension 17 is still in the same plane as the rest of
the sheet material 3.
[0013] As shown in FIG. 1, the spring 5 provides a current path 19.
The current path 19 extends from the contact member 9 to the
terminal 15 through the base 13 including the extension 17; the
extension 17 contributes to the electrical conductivity and to the
current transport of the spring 5.
[0014] The spring 5 has a folding edge 21 as shown in FIG. 1. The
sheet material 3 is folded along the folding edge 21 in order to
form the extension 17 which protrudes away from the remaining base
13; the extension 17 is shown in a pre-bent state P in FIG. 1. In
the shown embodiment, the extension 17 is formed by folding the
sheet material 3 around the folding edge 21 to an angle greater
than 0.degree. and less than or equal to 180.degree.. When the
extension 17 is folded around more than 90.degree. around the
folding edge 21, as shown in the bent state B in FIG. 2, the
folding edge 21 defines a lower border of the base 13. In the shown
embodiment, the folding edge 21 extends perpendicular to the
longitudinal direction L of the contact arm 7 and the extension 17
extends along the whole length of the folding edge 21.
[0015] The extension 17, as shown in FIG. 1, has a fixation element
25 formed by stamping or punching the sheet material 3. In the
shown embodiment, the extension 17 has two fixation elements 25.
The fixation elements 25, as shown in FIG. 3, protrude from a plane
of the sheet material 3 and are used to fix the spring 5 in a body
or housing of an electrical switch. In the bent state B shown in
FIG. 3, the fixation elements 25 protrude from the sheet material 3
in a direction opposing a direction in which a contact element 67
is arranged on the contact member 9. The fixation elements 25 are
disposed on support bases 27 which protrude from the extension 17.
The support bases 27 are shaped identically to parts of the spring
5 mirrored about the folding edge 21, therefore, when the extension
17 is folded 180.degree. around the folding edge 21, the support
bases 27 abut the identically-shaped counterparts so that the
fixation elements 25 are supported by a double-layered
structure.
[0016] The contact arm 7, as shown in FIG. 1, has a width 29
constant over most of the contact arm 7 except for a spring arm
extension 31, in which two identically-shaped spring arms 33
protrude from the contact arm 7. In order to keep a cross-sectional
area 35 of the contact arm 7 constant along the longitudinal
direction L, the contact arm 7 has an opening 37 in the spring arm
extension 31, which maintains a constant flexibility of the contact
arm 7 along the longitudinal direction L. In the case of a single
layer of sheet material 3, the cross-sectional area 35 is defined
by the width 29 multiplied by a thickness 39 of the sheet material
3 shown in FIG. 3.
[0017] The width 29 of the contact arm 7 measured perpendicular to
the longitudinal direction L is the smallest width 29 of the
contact arm 7. The width 29 is identical to a smallest width 41 of
the base 13 including the extension 17, which is identical to the
width 43 of the terminal 15. The widths 41 and 43 refer to the
spring 5 prior to any bending steps. With the widths 29, 41, 43 as
described, the current path 19 extends along the spring 5 without
extending through a section where the width is lower than the width
29 of the contact arm 7; a constant cross-sectional area is
achieved along the current path 19. When the sheet material 3 of
the extension 17 is folded around the folding edge 21, a cross
sectional area 45 of the base 13 including the extension 17,
defined by the width 41 of the base 13 multiplied by the thickness
39, remains constant even though the width 41 is decreased after
folding. A smallest cross-sectional area 45 of the base 13
including the extension 17 is equal to a smallest cross-sectional
area 35 of the contact arm 7.
[0018] The contact arm 7, as shown in FIG. 1, has a total length 47
measured from a center 49 of the contact member 9 to a lower border
23 of the base 13. Since the base 13 may form a stationary part in
an electrical switch, an effective length 51 of the contact arm 7
is measured between the center 49 of the contact member 9 and a
connection portion 53 of the contact arm 7. The connection portion
53 is the position at which the contact arm 7 extends from the base
13. The remaining base 13 has a small area between the folding edge
21 and the connection portion 53 and the effective length 51 is
comparatively large.
[0019] The terminal 15, as shown in FIG. 1, has a terminal folding
edge 55. The terminal folding edge 55 extends essentially parallel
to the longitudinal direction L. In the bent state B of the spring
5 as shown in FIGS. 2 and 3, a width 57 of the terminal 15 folded
along the terminal folding edge 55 is about half the width 43 of
the terminal 15 in the pre-bent state P. The terminal 15, however,
has an identical cross-sectional area in the pre-bent state P and
bent state B. In other embodiments, the terminal 15 may be folded
differently or may not be folded at all.
[0020] The same applies for the base 13 as shown in FIGS. 2 and 3,
which has a width 59 in the bent state B which is about half the
width 41 in the pre-bent state P, wherein the cross-sectional area
45 remains the same. The width 59 of the base 13 in the bent state
B is measured between the connection portion 53 and the lower
border 23.
[0021] As shown in FIG. 3, in the bent areas formed by the folded
terminal 15 and the folded extension 17, the total thickness 61 is
two times the thickness 31 of the sheet material when the extension
17 is folded around the folding edge 21 by 180.degree. to form a
double layer structure 63. The double layer structure 63 consists
of two layers 65 of sheet material 3.
* * * * *